CN201637641U - Freezing-thawing circulated coarse-grained soil shearing test device - Google Patents
Freezing-thawing circulated coarse-grained soil shearing test device Download PDFInfo
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- CN201637641U CN201637641U CN 201020020540 CN201020020540U CN201637641U CN 201637641 U CN201637641 U CN 201637641U CN 201020020540 CN201020020540 CN 201020020540 CN 201020020540 U CN201020020540 U CN 201020020540U CN 201637641 U CN201637641 U CN 201637641U
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Abstract
Disclosed is a freezing-thawing circulated coarse-grained soil shearing test device. A base is arranged on the left side of a rail; and a program control static strain gauge, a lower pressure transmitting plate, a displacement sensor support provided with a horizontal displacement sensor, and a stud bolt are arranged on the base. An upper counter-force plate is installed at the upper end of the stud bolt; a shear box group is arranged on the lower pressure transmitting plate; an upper pressure transmitting plate provided with a screw jack is installed on the shear box group; a perpendicular pressure sensor overlapped with the upper counter-force plate is arranged at the upper end of the screw jack; a rail wheel installed below the wheel frame is arranged on the right side of the rail; an electric motor and a perpendicular hydraulic jack connected with a fixed frame are arranged on the wheel frame; a gear meshed with a rack on the rail is arranged on an output shaft of the electric motor; a movable frame, a hydraulic oil pump and a horizontal hydraulic jack connected with the movable frame are arranged on the fixed frame; an upper shear box fixed plate overlapped with the shear box group is arranged at the left end of the upper portion of the fixed frame; a lower shear box fixed plate overlapped with the shear box group is arranged at the left end of the lower portion of the fixed frame; and a middle shear box fixed plate and a horizontal tension sensor overlapped with the sear box group are arranged at the left end of the movable frame.
Description
Technical field
The utility model belongs to the strength characteristics technical field with mechanical stress test solid material, is specifically related to apply stable shearing force.
Background technology
Before the making highway, need the earth roadbed compaction treatment of carrying out, making gathers materials and concrete material on earth roadbed then, in north cold season in winter, earth roadbed will freezing, volumetric expansion, when spring, weather was warm, earth roadbed the thawing of freezing, roadbed generation freeze thawing circulation change, roadbed occurs sinking, and the sinking crack appears in the concrete layer of laying of roadway, has influence on traffic safety.Before the making highway, need the roadbed soil sample is made a strength test.The large-scale coarse-grained soil boxshear apparatus that uses can only make a strength test to common coarse-grained soil at present, though its scope of application is wide, but for the special soil strength detection under given conditions that is run on the engineering limitation is arranged still, can not measure intensive parameter accurately according to actual project situation.
The saline soil area highway distress mainly contains that salt expands, frost boiling, molten falling into and type such as corrosion.Salinity can reduce pavement strength, weaken the seal effect, causes pavement destruction.Up to now, by the research that saliferous clay salt is expanded, people have had understanding comparatively all sidedly to the character of particulate saliferous clay, and it is bloated theoretical progressively to have formed comparatively perfect saliferous clay salt, but very few for the research of Coarse Saline.The temperature variation that produces along with season alternation in the Coarse Saline area can produce negative effect to the test soil sample intensity of Coarse Saline area roadbed, influences road passage capability.
In the testing equipment technical field of building the road, the urgent technical matters that solves of current need provides a kind of wide accommodation, automaticity height, and can test because temperature variation causes the coarse particle soil sample strength character testing tool of subgrade soil Strength Changes.
Summary of the invention
Technical problem to be solved in the utility model is to overcome the shortcoming of above-mentioned large-scale coarse-grained soil boxshear apparatus, and a kind of wide accommodation, automaticity height, test data freeze-thaw cycle coarse-grained soil shearing test device accurately is provided.
Addressing the above problem the technical scheme that is adopted is: be provided with base in the left side of track, at least be provided with 3 upper ends on the base double-screw bolt of reaction plate is housed, be installed in the right side that rail wheel under the wheel carrier is arranged on track, the vertical hydraulic lifting jack that wheel carrier is provided with motor and connects with fixed mount, the output shaft of motor is provided with and installs tooth bar meshed gears in orbit, movable stand is set on the fixed mount, hydraulic oil pump, the horizontal hydraulic pressure lifting jack that connects with movable stand, hydraulic oil pump links by pipeline and horizontal hydraulic pressure lifting jack, base is provided with program control statical strain indicator, following pressure transmission plate, displacement sensor bracket, establish the shear box group that is used to adorn the freezing-thawing test soil sample on the following pressure transmission plate, shear box group upper end is provided with uploads pressing plate, upload the pressing plate upper surface screw jack is set, the screw jack upper end is provided with the pressure at right angle sensor with last reaction plate overlap joint, and the horizontal displacement sensors with shear box group overlap joint is set on the displacement sensor bracket.Fixed mount top left end is provided with the last shear box fixed head, the bottom left end that overlap with the shear box group and is provided with the down cut box fixed head that overlaps with the shear box group, the movable stand left end is provided with the middle shear box fixed head with shear box group overlap joint, be provided with the horizontal pull sensor between middle shear box fixed head and the shear box group, pressure at right angle sensor, horizontal displacement sensors, horizontal pull sensor link to each other with program control statical strain indicator by lead.
The pressing plate of uploading of the present utility model is: lower cover is provided with loam cake, is provided with O-ring seal between loam cake and the lower cover.
Lower cover of the present utility model is: the circumference outer of lower cover is processed with connection holes, upper surface is processed with 2 circle cooling medium tanks at least, cooling medium tank be shaped as the annular plane groove, be processed with reinforcement between one a circle cooling medium tank and the adjacent circle cooling medium tank, be processed with breach on every circle reinforcement, the lower surface of lower cover is the plane.Loam cake of the present utility model is: the circumference outer of loam cake is processed with connection holes, upload pressing plate on cover and be processed with fluid hole and inlet opening.
A circle cooling medium tank of the present utility model equates with the groove width of an adjacent circle cooling medium tank.
Be processed with 4 breach that are spaced apart 90 ° on every circle reinforcement of the present utility model, the breach on the reinforcement is arranged on orthogonal two diameters of lower cover.
Of the present utility model upload pressing plate on cover the fluid hole of processing and inlet opening and be arranged on same the diameter through the center of circle.
Shear box group of the present utility model comprises 3 odd number shear boxs at least, at least be provided with on the vertical direction of the upper surface of middle shear box that shear box, lower surface are arranged with 1 down cut box on 1, last shear box and last shear box fixed head overlap joint, middle shear box and middle shear box fixed head overlap joint, down cut box and down cut box fixed head overlap joint.
Upward shear box, middle shear box, down cut box of the present utility model are tubular structure, the external diameter of last shear box, middle shear box, down cut box equates, the internal diameter of last shear box, middle shear box, down cut box equates, the internal diameter of last shear box equates that with the external diameter of uploading pressing plate the external diameter of down cut box equates with the internal diameter of following pressure transmission plate.
The left end of going up shear box fixed head, middle shear box fixed head, down cut box fixed head of the present utility model is a circular arc.
It is of the present utility model that a side of pressure transmission plate is processed with inlet opening down, opposite side is processed with fluid hole.
The utility model adopts uploading that setting constitutes the shear box group by shear box between pressing plate and the following pressure transmission plate, adorn tested test soil sample in the shear box, upload in pressing plate and the following pressure transmission plate and be processed with cooling medium tank, when test, refrigerant enters in the cooling medium tank of lower cover from inlet opening, in cooling medium tank, circulate, flow out, transmit temperature and transmission pressure at right angle for the test soil sample from fluid hole.The utility model combines freezing and thawing test and strength test, can directly make a strength test after carrying out freezing and thawing test, can accurately measure the intensity index of roadbed soil sample after the process freeze thawing.When last roadbed and following roadbed since outside low temperature cause about under the situations such as roadbed soil sample Strength Changes is different, also can control roadbed test soil sample temperature inside and change, carry out the intensity index of shear test testing experiment soil sample then by the temperature of pressure transmission plate about regulating.The utlity model has advantages such as wide accommodation, automaticity height, test data be accurate, can be used for northern area because season or diurnal temperature change the measurement that causes roadbed soil sample Strength Changes, also can be used for saline soil area because temperature variation causes the measurement of salt marsh roadbed soil sample Strength Changes.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the utility model.
Fig. 2 is the structural representation of middle shear box 7 among Fig. 1.
Fig. 3 is a structural representation of uploading pressing plate 5 among Fig. 1.
Fig. 4 is the front view of lower cover 5-1 among Fig. 3.
Fig. 5 is the left view of Fig. 4.
Fig. 6 is the front view of loam cake 5-2 among Fig. 3.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described, but the utility model is not limited to these embodiment.
Embodiment 1
At Fig. 1, in 2, the freeze-thaw cycle coarse-grained soil shearing test device of present embodiment is by last reaction plate 1, double-screw bolt 2, pressure at right angle sensor 3, screw jack 4, upload pressing plate 5, last shear box 6, middle shear box 7, middle shear box fixed head 8, horizontal pull sensor 9, last shear box fixed head 10, fixed mount 11, movable stand 12, horizontal hydraulic pressure lifting jack 13, hydraulic oil pump 14, vertical hydraulic lifting jack 15, wheel carrier 16, gear 17, motor 18, rail wheel 19, tooth bar 20, down cut box fixed head 21, track 22, base 23, down cut box 24, following pressure transmission plate 25, displacement sensor bracket 26, displacement transducer 27, program control statical strain indicator 28 connects formation.
Be placed with base 23 in the left side of track 22, program control statical strain indicator 28 is installed on the base 23, the model of program control statical strain indicator 28 is YE2533, and program control statical strain indicator 28 is used for the signal of input is carried out data processing according to the program of prior setting, output result of calculation.By thread connection 4 double-screw bolts 2 are installed on the base 23, the upper end of double-screw bolt 2 is equipped with reaction plate 1 by thread connection, on base 23, be fixedly connected pressure transmission plate 25 with the screw threads for fastening connector, be placed with down cut box 24 on the following pressure transmission plate 25, the upper ends of down cut box 24 has middle shear box 7, the upper ends of middle shear box 7 has last shear box 6, last shear box 6, middle shear box 7, the external diameter of down cut box 24 equates, last shear box 6, middle shear box 7, the internal diameter of down cut box 24 equates, last shear box 6, middle shear box 7, down cut box 24 is a tubular structure, the top and bottom smooth finish of middle shear box 7 is higher, the two ends up and down of middle shear box 7 are edge of a knife shape, wedge angle α is 20 °, wedge angle α also can be 10 °, can also be 30 °, be used for reducing shear box 7 and last shear box 6, the friction factor of surface of contact and contact area between the down cut box 24, the close two ends up and down of the lateral surface of middle shear box 7 have been fixedly connected symmetrically with the screw threads for fastening connector respectively and have connected ear 7-1, the lower end of last shear box 6, the upper end of down cut box 24 has been fixedly connected symmetrically with the screw threads for fastening connector and has connected ear 7-1,7-1 is processed with screw on the connection ear, be used for shear box 7 and last shear box 6 when the system soil sample, down cut box 24 is used Bolt Connection, last shear box 6, middle shear box 7, the soil sample of tested shearing force is housed in the down cut box 24.The upper ends of last shear box 6 is uploaded pressing plate 5, the external diameter of uploading pressing plate 5 equates with the internal diameter of last shear box 6, the upper surface of uploading pressing plate 5 is equipped with screw jack 4, the upper end of screw jack 4 is equipped with pressure at right angle sensor 3, pressure at right angle sensor 3 and last reaction plate 1 overlap joint, pressure at right angle sensor 3 links to each other with program control statical strain indicator 28 by lead, rotating screw lifting jack 4, to last shear box 6, middle shear box 7, test soil sample vertical direction in the down cut box 24 loads, pressure at right angle sensor 3 will receive last shear box 6, middle shear box 7, the power of the vertical direction that the test soil sample in the down cut box 24 is applied converts electric signal to and outputs to program control statical strain indicator 28, program control statical strain indicator 28 carries out data processing according to the program of prior setting, calculate shear box 6, middle shear box 7, the vertical load that test soil sample in the down cut box 24 is born, during to pre-constant load, keep the vertical direction load constant.On the base 23 displacement sensor bracket 26 is being installed between program control statical strain indicator 28 and the double-screw bolt 2, be fixedly connected with the screw threads for fastening connector on the displacement sensor bracket 26 horizontal displacement sensors 27 is installed, horizontal displacement sensors 27 and middle shear box 7 overlap joints, horizontal displacement sensors 27 links to each other with program control statical strain indicator 28 by lead, the horizontal shift conversion of signals of shear box 7 became electric signal to output to program control statical strain indicator 28 during horizontal displacement sensors 27 will receive, and program control statical strain indicator 28 calculates the horizontal displacement of middle shear box 7 when loading according to the program of prior setting.
Fig. 3～6 have provided the structural representation of uploading pressing plate 5.In Fig. 3～5, the pressing plate 5 of uploading of present embodiment is made of lower cover 5-1, loam cake 5-2, O-ring seal 5-3 connection.Loam cake 5-2, lower cover 5-1 are shaped as circle, with the screw threads for fastening connector loam cake 5-2 that has been fixedly connected, between loam cake 5-2 and the lower cover 5-1 O-ring seal 5-3 are installed on lower cover 5-1.The uniform circle connection holes that is processed with in the circumference outer of lower cover 5-1, upper surface is processed with 4 circle cooling medium tank a, cooling medium tank a is shaped as the annular plane groove, cooling medium tank a is used to adorn refrigerant, refrigerant can adopt alcohol, low temperature resistant liquid such as anti freezing solution, one circle cooling medium tank a equates with the groove width of an adjacent circle cooling medium tank a, be processed with reinforcement 5-1.1 between one a circle cooling medium tank a and the adjacent circle cooling medium tank a, be processed with 4 breach b that are spaced apart 90 ° on every circle reinforcement 5-1.1, breach b on the 3 circle reinforcement 5-1.1 is arranged on orthogonal two diameters of lower cover 5-1, and the lower surface of lower cover 5-1 is the plane.The uniform circle hole that is processed with, the circumference outer of loam cake 5-2, be processed with fluid hole and inlet opening on the loam cake 5-2, fluid hole and inlet opening processing are on same diameter through the center of circle, fluid hole and inlet opening are through hole, loam cake 5-2 is covered after on the lower cover 5-1, and when test, refrigerant enters in the cooling medium tank a of lower cover 5-1 from inlet opening, in cooling medium tank a, circulate, flow out from fluid hole.This structure upload pressing plate 5, its external diameter equates with the internal diameter of last shear box 6, when carrying out shear test, transmits temperature for the test soil sample and transmits pressure at right angle.
The inner structure of following pressure transmission plate 25 is identical with the inner structure of uploading pressing plate 5, the physical dimension of following pressure transmission plate 25 is greater than the physical dimension of uploading pressing plate 5, following pressure transmission plate 25 internal diameters equate with the external diameter of down cut box 24, and the inlet opening of following pressure transmission plate 25 and the both sides that fluid hole lays respectively at down pressure transmission plate 25.
In the present embodiment, the shear box group goes up shear box 6 by 7,3 of 24,2 middle shear boxs of 1 down cut box and constitutes, and the structure of last shear box 6, middle shear box 7, down cut box 24 is identical with embodiment 1.Be placed with down cut box 24 on the following pressure transmission plate 25, the upper end of down cut box 24 is equipped with shear box 7 in first, on the middle shear box 7 shear box 6 is installed, the upper end of last shear box 6 is equipped with shear box 7 in another, upper end of shear box 7 is equipped with and goes up shear box 6 topmost in another, and the upper surface of shear box 6 is placed with and uploads pressing plate 5 on the top.The connecting relation of other parts and parts is identical with embodiment 1.During test, the operation of vertical lifting jack, fixed mount 11 is risen, last shear box fixed head 10 is stuck in the right side of going up shear box 6 topmost, middle shear box fixed head 8 is stuck in the right side of going up shear box 6 in another, down cut box fixed head 21 is stuck in the right side of shear box 6, and the freeze thawing soil in the shear box in another 7 is carried out shear strength test, and experimentation is identical with embodiment 1.Remove and go up a last shear box 6 most and shear box 7 in another, use shear box 6, shear box 7, down cut box 24 in first, carry out the shear strength test second time, during test, operation of vertical hydraulic jack 15, fixed mount 11 is descended, last shear box fixed head 10 is stuck in the right side of shear box 6, the right side of going up shear box 6 during middle shear box fixed head 8 is stuck in, the right side of down cut box fixed head 21 card down cut boxes 24, freeze thawing soil in the centering shear box 7 carries out shear strength test, and experimentation is identical with embodiment 1.The present embodiment freeze-thaw cycle coarse-grained soil shearing test device can carry out by directly the test soil sample being carried out shear test after the cyclic test of uniform temperature gradient cooling.
In embodiment 1,2, the lower cover 5-1 upper surface of uploading pressing plate 5 is processed with 2 circle cooling medium tank a, cooling medium tank a is shaped as the annular plane groove, be processed with 1 circle reinforcement 5-1.1 between the 2 circle cooling medium tank a, the structure of reinforcement 5-1.1 is identical with embodiment 1, and other shape of loam cake 5-2 is identical with embodiment 1.The connecting relation of other parts and parts is identical with respective embodiments.
In above embodiment 1～3, by thread connection 3 double-screw bolts 2 are installed on the base 23, the upper end of double-screw bolt 2 is equipped with reaction plate 1 by thread connection.The connecting relation of other parts and parts is identical with respective embodiments.
Claims (10)
1. freeze-thaw cycle coarse-grained soil shearing test device, be provided with base (23) in the left side of track (22), at least be provided with 3 upper ends on the base (23) double-screw bolt (2) of reaction plate (1) is housed, be installed in the right side that rail wheel (19) under the wheel carrier (16) is arranged on track (22), the vertical hydraulic lifting jack (15) that wheel carrier (16) is provided with motor (18) and connects with fixed mount (11), the output shaft of motor (18) is provided with and is installed in tooth bar (20) meshed gears (17) on the track (22), movable stand (12) is set on the fixed mount (11), hydraulic oil pump (14), the horizontal hydraulic pressure lifting jack (13) that connects with movable stand (12), hydraulic oil pump (14) links by pipeline and horizontal hydraulic pressure lifting jack (13), it is characterized in that: base (23) is provided with program control statical strain indicator (28), following pressure transmission plate (25), displacement sensor bracket (26), establish the shear box group that is used to adorn the freezing-thawing test soil sample on the following pressure transmission plate (25), shear box group upper end is provided with uploads pressing plate (5), upload pressing plate (5) upper surface screw jack (4) is set, screw jack (4) upper end is provided with the pressure at right angle sensor (3) with last reaction plate (1) overlap joint, and displacement sensor bracket (26) is gone up the horizontal displacement sensors (27) that is provided with shear box group overlap joint; Fixed mount (11) top left end is provided with the last shear box fixed head (10), the bottom left end that overlap with the shear box group and is provided with the down cut box fixed head (21) that overlaps with the shear box group, movable stand (12) left end is provided with the middle shear box fixed head (8) with shear box group overlap joint, be provided with horizontal pull sensor (9) between middle shear box fixed head (8) and the shear box group, pressure at right angle sensor (3), horizontal displacement sensors (27), horizontal pull sensor (9) link to each other with program control statical strain indicator (28) by lead.
2. according to the described freeze-thaw cycle coarse-grained soil shearing test device of claim 1, it is characterized in that the said pressing plate (5) of uploading is: lower cover (5-1) is provided with loam cake (5-2), is provided with O-ring seal (5-3) between loam cake (5-2) and the lower cover (5-1).
3. according to the described freeze-thaw cycle coarse-grained soil shearing test device of claim 2, it is characterized in that said lower cover (5-1) is: the circumference outer of lower cover (5-1) is processed with connection holes, upper surface is processed with 2 circle cooling medium tanks (a) at least, cooling medium tank (a) be shaped as the annular plane groove, be processed with reinforcement (5-1.1) between one a circle cooling medium tank (a) and the adjacent circle cooling medium tank (a), be processed with breach (b) on every circle reinforcement (5-1.1), the lower surface of lower cover (5-1) is the plane; Said loam cake (5-2) is: the circumference outer of loam cake (5-2) is processed with connection holes, uploads on the loam cake (5-2) of pressing plate (5) and is processed with fluid hole and inlet opening.
4. according to the described freeze-thaw cycle coarse-grained soil shearing test device of claim 3, it is characterized in that: a said circle cooling medium tank (a) equates with the groove width of an adjacent circle cooling medium tank (a).
5. according to the described freeze-thaw cycle coarse-grained soil shearing test device of claim 3, it is characterized in that: be processed with 4 breach (b) that are spaced apart 90 ° on said every circle reinforcement (5-1.1), the breach (b) on the reinforcement (5-1.1) is arranged on orthogonal two diameters of lower cover (5-1).
6. according to the described freeze-thaw cycle coarse-grained soil shearing test device of claim 3, it is characterized in that: the said loam cake (5-2) of uploading pressing plate (5) is gone up the fluid hole of processing and inlet opening and is arranged on same the diameter through the center of circle.
7. according to the described freeze-thaw cycle coarse-grained soil shearing test device of claim 1, it is characterized in that: said shear box group comprises 3 odd number shear boxs at least, at least upward shear box (6), lower surface are arranged with 1 down cut box (24) to be provided with 1 on the upper surface vertical direction of middle shear box (7), last shear box (6) and last shear box fixed head (10) overlap joint, middle shear box (7) and middle shear box fixed head (8) overlap joint, down cut box (24) and down cut box fixed head (21) overlap joint.
8. according to the described freeze-thaw cycle coarse-grained soil shearing test device of claim 7, it is characterized in that: said upward shear box (6), middle shear box (7), down cut box (24) are tubular structure, the external diameter of last shear box (6), middle shear box (7), down cut box (24) equates, the internal diameter of last shear box (6), middle shear box (7), down cut box (24) equates, the internal diameter of last shear box (6) equates that with the external diameter of uploading pressing plate (5) external diameter of down cut box (24) equates with the internal diameter of following pressure transmission plate (25).
9. according to claim 1 or 7 described freeze-thaw cycle coarse-grained soil shearing test devices, it is characterized in that: the said left end of going up shear box fixed head (10), middle shear box fixed head (8), down cut box fixed head (21) is a circular arc.
10. according to claim 1 or 7 or 8 described freeze-thaw cycle coarse-grained soil shearing test devices, it is characterized in that: said a side of pressure transmission plate (25) is processed with inlet opening down, opposite side is processed with fluid hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020020540 CN201637641U (en) | 2010-01-22 | 2010-01-22 | Freezing-thawing circulated coarse-grained soil shearing test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020020540 CN201637641U (en) | 2010-01-22 | 2010-01-22 | Freezing-thawing circulated coarse-grained soil shearing test device |
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| CN201637641U true CN201637641U (en) | 2010-11-17 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313673A (en) * | 2011-08-04 | 2012-01-11 | 北京交通大学 | Full-automatic, digital and large frozen soil direct shear apparatus |
| CN103422484A (en) * | 2013-07-15 | 2013-12-04 | 西南交通大学 | Method for evaluating ground coefficient K30 values of high-speed railway bed coarse particle soil padding |
| CN105758738A (en) * | 2016-04-22 | 2016-07-13 | 西安石油大学 | Electric double-surface shear apparatus |
| CN106596295A (en) * | 2017-01-13 | 2017-04-26 | 中国矿业大学(北京) | Angle-variable subzero-temperature direct shear apparatus for rock and test operation method |
| CN106769410A (en) * | 2016-12-20 | 2017-05-31 | 盐城工学院 | A kind of frozen soil rotation shearing device |
| CN107515159A (en) * | 2017-08-24 | 2017-12-26 | 河南城建学院 | Concrete freezing-thawing test device and test method |
-
2010
- 2010-01-22 CN CN 201020020540 patent/CN201637641U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313673A (en) * | 2011-08-04 | 2012-01-11 | 北京交通大学 | Full-automatic, digital and large frozen soil direct shear apparatus |
| CN102313673B (en) * | 2011-08-04 | 2012-12-26 | 北京交通大学 | Full-automatic, digital and large frozen soil direct shear apparatus |
| CN103422484A (en) * | 2013-07-15 | 2013-12-04 | 西南交通大学 | Method for evaluating ground coefficient K30 values of high-speed railway bed coarse particle soil padding |
| CN105758738A (en) * | 2016-04-22 | 2016-07-13 | 西安石油大学 | Electric double-surface shear apparatus |
| CN106769410A (en) * | 2016-12-20 | 2017-05-31 | 盐城工学院 | A kind of frozen soil rotation shearing device |
| CN106769410B (en) * | 2016-12-20 | 2023-09-19 | 盐城工学院 | Frozen soil rotary shearing device |
| CN106596295A (en) * | 2017-01-13 | 2017-04-26 | 中国矿业大学(北京) | Angle-variable subzero-temperature direct shear apparatus for rock and test operation method |
| CN106596295B (en) * | 2017-01-13 | 2018-12-21 | 中国矿业大学(北京) | A kind of varied angle subzero temperature rock direct shear apparatus and experimental working technique |
| CN107515159A (en) * | 2017-08-24 | 2017-12-26 | 河南城建学院 | Concrete freezing-thawing test device and test method |
| CN107515159B (en) * | 2017-08-24 | 2019-11-01 | 河南城建学院 | Concrete freezing-thawing test device and test method |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20130122 |